exam Maths Puzzle Numerical Ability

y=2x-7
3x-4y=8
help please =]

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Can someone help me on this problem?

I need to list all the factors of 45

Thanks,
Sher ) In 1/4 of an hour more time. Jack. riding his bicycle at 12 miles per hour, rode 6 miles farther than Nikki, who was riding her bicycle at 10 miles per hour. How long did Jack ride?